'use strict';
    function success(text) {
        var textarea = document.getElementById('test-ie-response-text');
        document.getElementById().innerText = text;
        console.log(text);
    }

    function fail(code) {
        var textarea = document.getElementById('test-ie-response-text');
       
    }

     var request = new XMLHttpRequest(); // 新建Microsoft.XMLHTTP对象

    request.onreadystatechange = function () { // 状态发生变化时，函数被回调
        if (request.readyState === 4) { // 成功完成
            // 判断响应结果:
            if (request.status === 200) {
                // 成功，通过responseText拿到响应的文本:
                return success(request.responseText);
            } else {
                // 失败，根据响应码判断失败原因:
                return fail(request.status);
            }
        } else {
            // HTTP请求还在继续...
        }
    }

    // 发送请求:
    request.open('get', 'https://api.openweathermap.org/data/2.5/forecast?q=Beijing,cn&appid=800f49846586c3ba6e7052cfc89af16c');
    request.send();

    // alert('请求已发送，请等待响应...');
